He said the reason he had decided to leave the party, where he is still seen as the de facto leader, was to protect it from the fallout from fraud charges against him.
In 2013, Uspaskich was sentenced to four years in prison by Vilnius District Court for bookkeeping fraud at the Labour Party, but he has challenged the ruling. The Lithuanian Court of Appeals is expected to deliver its verdict in the case in February.
"I have had the honour to be part of the Lithuanian political life for years. I have been a minister, a Seimas [Lithuanian parliament] member and now I am a European Parliament member. I feel, however, that I've accomplished everything that was in my power," Uspaskich told reporters on Wednesday. He also claimed that the case against him was politically motivated.
Uspaskich, a businessman of Russian descent and one of the richest people in Lithuania, founded the Labour Party in 2003 and it became the biggest parliamentary group (with 39 seats in the 141-seat legislature) after the general elections the following year.
He was a Seimas member in 2008-2009 and in 2012-2014 and was elected to the European Parliament in 2009 and 2014. He served briefly as the minister of economy in 2004-2005, resigning from the post after the Seimas Commission on Ethics ruled he had mixed up his private and public interests.
Charges were brought against Uspaskich and several other leaders of the Labour Party in 2011 after an inquiry into suspected trade in political favours and fraud in the party's bookkeeping. Charges against the Labour Party itself were dropped after it was reorganized in 2013.
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